How can tartar and plaque be removed from teeth without grinding? is there any paste, etc. for it?
The girders of a suspension bridge form an arc. The definition of an arc is a curve or bowed shape, like a part of a circle. An example of an arc is a rainbow. To arc is defined as to make a curved shape or move in a curved path.
arc noun [ C ] (CURVE) âº 1  the shape of part of a circle, or other curved line. âº 2  a powerful flow of electricity that goes across a space between two points. âº [ 3  I ] to move in the shape of an arc. âº [  I usually + adv/prep ] to make an electric arc.